Answer: The correct answer is 6 weeks.
Step-by-step explanation: In order to determine how long it will take him to pay for his new theater system you need to divide the total cost by the amount that he is paying per week. The formula is: $324/$54 = 6 weeks.
It would be easier to create a table so that he can keep track of what his remaining balance is and how many weeks of payments he has left.